Discovery and chemistry of amino acids -- Protein digestion and absorption of peptides and amino acids -- Synthesis of amino acids -- Degradation of amino acids -- Synthesis and catabolism of special nitrogenous substances from amino acids -- Synthesis of urea and uric acid -- Use of isotypes for studying amino acid metabolism -- Protein synthesis -- Intracellular protein degradation -- Regulation of amino acid metabolism -- Physiological functions of amino acids -- Inborn errors of amino acid metabolism -- Dietary requirements of amino acids